Bulldozer attachment



Nov. 7, 1950 'r. 'ANDERSEN BULLDOZER ATTACHMENT 4 Sheets-Sheet 1 Filed Feb- 20, 1946 lnvFuFR m e/ mule-sw- R xv um Nov. 7; 1950 T. ANDERSEN 2,529,208

BULLDOZER ATTACHMENT Filed Feb. 20, 1946 4 Sheets-Sheet 2 Xwa afi. Wujf/ hdersey gMM.-,...

Nov. 7, 1950 'r. ANDERSEN BULLDQZER ATTACHMENT 4 Sheets-Sheet 3 Filed Feb. 20, 1946 'HL J Aadrnr Nov. 7, 1950 'r. ANDERSEN BULLDOZER ATTACHMENT Filed Feb. 20, 1946 4 Sheets-Sheet 4 f m m r O i M 0 M min r Patented Nov. 7, 1950 BULLDOZER ATTACHMENT Tengel Andersen, Staten Island, N. Y., assignor to Certified Equipment Corp., New York, N. Y., a corporation of New York Application February 20, 1946, Serial No. 648,875

UNITED STATES PATENT OFFICE Heretofore, where the bulldozer blade has been with my novel bulldozer and scoop attachment, hydraulically controlled, the hydraulic unit has the blade and scoop being shown as latched in been so located on the tractor as either to obtheir lowered position. scure the vision of the operator or to be subject Figure 2 is top plan view of the structure to dirt and grit from the tracks. This has been shown in Figure 1. especially true where two hydraulic rams are Figure 3 is front elevation thereof, and provided, one at each side of the tractor, near Figure 4 is a partial side elevation showing the tracks. the blade and scoop when in their raised position.

In accordance with my present invention I Referring to the drawings, I have designated provide a single hydraulic unit, consisting of a generally at H a tractor of the crawler type hydraulic ram, an oil reservoir and a valve for having as essential elements track mountings I2, controlling the bulldozer blade, and I mount tracks 13, a power plant housed beneath the such unit on top of the engine hood of the hood M, a drawbar connection i5, and a tractor tractor, preferably in the fore and aft line frame 25. thereof, where it will neither obscurethe oper- The drawbar connection [5 includes a cross ators vision nor be subject to dirt and grit from shaft [6 to the ends of which is pivotally mountthe tracks. ed the rear ends of a pair of forwardly-extend- My construction is characterized by the furing bulldozer arms I! located inside of the tracks. ther features that in it the bulldozer arms are Secured to the front ends of the arms I! is a mounted inside of the tracks, which gives an bulldozer blade l8 provided with adjustable shoes unobstructed clearance as compared with the l9 and side plates 20. Each shoe! is adjustconventional outside of tracks mounting, and ably mounted on blade l8 by means of a rethat said arms are directly connected to the movable fastening bolt or the like and a series dnawbar connection, thereby eliminating any of holes l9 so that it may be adjusted to comundue stress or strain on the track frames. pcnsate for wear. At the upper medial portion One outstanding advantage of my construction of the blade I8 is a pair of lugs 2| having a is that it enables me "to mount the bulldozer pivot shaft 22 mounted therein. blade in very close proximity to the front of the Rising. from the frame 25, at each side of the tractor, thereby materially shortening the overhood l4, and extending upwardly from a point all length of the apparatus as well as eliminating slightly above the top of the hood M, are frame the structural weaknesses which exist where the members 23. Secured to the upper ends of blade has to be mounted a substantial distance the members 23 is a platform 24, such platform in advance of the tractor radiator. being made preferably from a length of channel In connection with such arrangement, and as iron. an additional feature thereto, I provide a quick- Adjacent the forward end of the platform 24 detachable scoop for the bulldozer blade whereby is a shaft 26 on which is pivotally mounted one a load may be scooped up and carried to any end of an arcuate shaped link member 28. This desired point and there dumped by simply triparcuate shaped link member or bell crank 28 ping a latch My scoop may be attached and extends forwardly from its pivot point, and detached from the blade in the minimum time thence downwardly to a point 29, thus following and with the minimum effort. It is so balanced generally the contour of the front portion of the that it will dump itself without creating any hood I4. At the point 29 of the link member severe shock and may be automatically re- 28 is a transverse shaft 30 to which is connected latched in position to repeat the scooping operthe upper end of a connecting link 3|. The lower ation by simply dropping the blade and scoop end of said link is pivotally mounted on the shaft down onto the ground. 5" 22 at the upper end of the bulldozer blade l8.

Other objects and novel features of the con- Extending transversely of the platform 24 is a struction and arrangement of parts comprising shaft 32' to which is pivotally attached the rear my improved apparatus, together with the adend of a double acting hydraulic ram 32. The vantages which result therefrom, will appear as piston rod 33 of said ram extends forwardly and the description of the invention progresses. is pivotally attached to the link member 29 by the 2 Claims.

My present invention relates to apparatus for moving earth and the like, and particularly to an improved bulldozer and scoop attachment for the same.

In the accompanying drawings wherein I have illustrated a preferred embodiment of my inventlon:

Figure 1 is a side elevation of a tractor equipped shaft 34. It will be noted that shaft 34- is spaced apart from the shaft 26 and, as the double acting ram 32 is pivotally mounted at 32' at its rear end, rearward movement of the piston rod 33 will cause a pivotal movement of the link 28 about the pivot shaft 29 through an angle of approximately 90 thus causing an upward movement of the bulldozer blade 18 (see Fig. 4).

On the frame 25 is located an oil pump 35 and on the platform 24 is located a valve 35. The valve 16 is controlled by means of a valve throttle 31 and connection 30, the valve throttle 31 being pivotally mounted at the upper end of a standard 39 secured to the frame 25 within easy reach of the operator. The oil pump 35 is connected to the valve 35 by the flexible hose 40 and 4|, and the valve 38 is connected to the double acting hydraulic ram by the hose 42 and 43.

By directly connecting the rear ends of the bulldozer arms 11 to the drawbar connection l of the tractor and thus between the tracks and the power plant of the tractor, unobstructed clearance of the conventional outside of tracks mounting is accomplished. Further, the direct connection of the bulldozer arms with the drawbar connection l5 eliminates any undue stresssor strain on the track frames.

The installation of the hydraulic ram, valve, and valve control means as a unit on or over the hood of the power plant of the tractor is advantageous because so located these parts do not obstruct the vision of the operator,

In connection with the structure shown, I prefer to provide a quick-detachable scoop 45 for the bulldozer blade I8. Accordingly I provide the side plates 20 of bulldozer blade l8 with a pair of aligned holes. The scoop 45, having spaced side or end walls 46, a top bar 41, and a bottom 48, also has in its side or end walls 46 holes in alignment with the holes in the side walls of bulldozer blade 18. Removable bolts 50 pass through the aligned holes in side plates 20, of blade l8 and scoop 45,'

respectively, and pivotally mount scoop 45 on the front of bulldozer blade 10.

The scoop is latched in position on the blade by a lever latch 51, which is pivoted on the upper end of bulldozer blade l8. Latch 5| engages top bar 41 of the scoop and holds such scoop in locked position. Attached to latch lever 5| is one end of a monkey line 52, the other end of such line being within easy reach of the operator.

Assuming that the bulldozer arms II have been lowered to bring the blade it into engagement with the ground, the contact of the scoop 45 with the ground will rotate the scoop about the bolts 50 relative to bulldozer blade I! and will cause its top bar 41 to be engaged by the lever latch 5|.

The scoop 45 is now held in latched position and the apparatus is operated in the usual manner to load the scoop. When the scoop is loaded, the operator transports the same to the point of dumping, and after moving the scoop to the proper point. pulls the. monkey line 52 to release the lever latch 5| from the top bar 41, whereupon the weight of the load will cause the scoop to rotate on the bolts 50 in reverse direction and thus dump the load (see Figure 4). When the blade is dropped to the ground again, the latching engagement is automatically restored.

To remove the scoop from the bulldozer it is only necessary to remove the two bolts 50.. The lever latch 5| and monkey line 52 may be removed at the same time, or may be left in position, as

' dozer blade, and the scoop attachmentifsuch be their presence or absence does not afie'ct the oper v ation of the bulldozer. v I

From the foregoing-description, taken in connection with the accompanying drawings, it is evident that I have provided a simple, inexpensive and effective construction for controlling the bullused.

Although I have described my invention in connection with a tractor of the crawler type, it is to be understood that the principles are equally applicable to a wheeled tractor, and that the term tractor" as used herein is inclusive of both such types of tractors.

Similarly, while I have discloseda preferred embodiment of my invention, I recognize that the same may be modified in many respects to suit particular operating conditions without departing from the principles of my invention. Accordingly, all such changes are to be considered as within the purview of my invention if within the scope thereof as setforth in the appended claims. I

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent is: 1. In combination with atr'actor, a pair of arms pivotally attached at their rear ends to the tractor and extending forwardly along the sides of the tractor, a blade carried at the forward ends of said arms and extending across the tractor in front of the same, said blade having side plates and a pair of alined bearings in said side plates, a scoop having a top cross-bar, a bottom and side plates, and a pair of alined hearings in said side plates registering with the hearings in the side plates of said blade, pivot members passing through said pairs of bearings for pivotally mounting the scoop on the blade, a latchpivoted to the blade adjacent the upper edge thereof and adapted to be engaged by the top cross bar of said scoop whenever the blade. and scoop are dropped against the ground and the scoop thereby caused to rotate in a direction to engage said cross bar with said latch, and an operatoractuated cable for releasing said latch to permit the loaded scoop to rotate in reverse direction and dump its load.

2. The structure of claim 1 wherein the pivot members for theblade and scoop are located adjacent the rear edges of the side plates of the blade and scoop and at points below the horizontal center line of said plates.

'I'ENGEL ANDERSEN.

REFERENCES CITED I The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,997,001 Lamb Apr. 9, 1935 2,163,662 Bufllngton June 27, 1939 2,216,572 Nichols, Jr Oct. 1, 1940 2,290,737 Chadwick, Jr. July 21, 1942 2,303,001 Ruddock Nov. 24, 1942 2,307,655 Arps Jan. 5, 1943 2,332,561 Drott Oct. 26, 1943 2,334,374 Austin Nov. 16, 1943 2,404,926 Schmacht July 30, 1946 2,450,905 Mork Oct. 12, 1948 2,483,006 Hamilton Sept. 27, 1949 

